﻿using System;
using System.Collections.Generic;
using System.Web;


namespace CCPSIP.Group
{
    /// <summary>CCPSIP_020：加入聊天群組 API</summary>
    /// idHeader = 裝置 UUID 前八碼。iOS 請使用 [CCPCrypto getIdHeader] 呼叫。
    /// checkcode = 裝置限時驗證碼。iOS 請使用 [CCPCrypto getCheckcode] 呼叫。
    /// GroupID = Client端的群組ID。
    /// NewMembers = 新群組成員帳號字串，帳號間以","分隔。

    public class join_group : IHttpHandler
    {
        private static string[] mSeparator = { "," };


        public void ProcessRequest(HttpContext context)
        {
            HttpRequest req = context.Request;
            HttpResponse resp = context.Response;
            resp.ContentType = "text/plain";
            resp.ContentEncoding = System.Text.Encoding.UTF8;
            DateTime reqTime = DateTime.Now;
            string resultStr = "";

            try
            {
                //【01】取得POST參數，驗證身分
                //
                string idHeader = req.Form["idHeader"];
                string checkcode = req.Form["checkcode"];
                string ClientGID = req.Form["GroupID"];//Client端的群組ID
                List<string> newMembers = new List<string>();//新群組成員帳號List

                SipUserInfo userInfo = SipKit.GetUserInfo(idHeader, checkcode, req);
                if (userInfo == null)
                {
                    throw new Exception("Error_01: Cannot identify this device");//無法識別此裝置
                }

                try
                {
                    string[] mArray = req.Form["NewMembers"].Split(mSeparator, StringSplitOptions.RemoveEmptyEntries);
                    for (int i = 0; i < mArray.Length; i++)
                    {
                        string member = mArray[i].Trim();
                        if (!newMembers.Contains(member))
                            newMembers.Add(member);
                    }
                    newMembers.Sort();
                }
                catch (Exception ex)
                {
                    ChrisKit.SkipVar(ex);
                    throw new Exception("Error_02: Parameter Error");//參數錯誤
                }


                //【02】檢查User是否為群組成員
                //
                if (!OracleKitGroup.isMemberOfGroup(userInfo.SIP_Num, ClientGID))
                {
                    throw new Exception("Error_03: You are not a member");//你不是群組成員
                }


                //【03】清理重覆加入成員
                //
                ChatGroupMember[] oldMembers = OracleKitGroup.getMembers(ClientGID);
                foreach (ChatGroupMember oldMember in oldMembers)
                {
                    if (newMembers.Contains(oldMember.MemberID))
                        newMembers.Remove(oldMember.MemberID);
                }


                //【04】DB Operation: 加入聊天群組
                //
                OracleKitGroup.JoinGroup(userInfo, ClientGID, newMembers.ToArray());


                //【98】通知Push Service
                //
                PushKit.WakePushAsync(PushKit.PushType.Msg);


                //【99】回傳結果
                //
                resultStr = "OK";
            }
            catch (Exception ex)
            {
                resp.ContentType = "application/xml";
                resultStr = ChrisKit.Ex2Xml(ex, false);
            }
            finally
            {
                int contentLength = resp.ContentEncoding.GetByteCount(resultStr);
                resp.AppendHeader("Content-Length", contentLength.ToString());
                resp.Write(resultStr);
                resp.Flush();
                resp.Close();
            }
        }


        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

    }
}
